What happens to index once the table got dropped?

StackOverflow https://stackoverflow.com/questions/8433011

  •  11-03-2021
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Question

After dropping the table, found that the index created on the columns of the dropped table is gone. I just want to know what happens after that. Could someone please explain?

What all are the others getting dropped along with table drop?

Was it helpful?

Solution

In Oracle when dropping a table

  • all table indexes and domain indexes are dropped
  • any triggers defined on the table are dropped
  • if table is partitioned, any corresponding local index partitions are dropped
  • if the table is a base table for a view or if it is referenced in a stored procedure, function, or package, then these dependent objects are invalidated but not dropped

OTHER TIPS

By default, MS Sql Server also drops indexes when a table is dropped. (Observed in version 13.0.4206.0.)

MySQL also drops table indexes when tables are dropped.

For more info, see Does dropping a table in MySQL also drop the indexes?

In Postgres 

DROP TABLE always removes -
1. any indexes
2. rules
3. triggers
4. constraints
that exist for the target table.
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